|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Crinoidea - Cladida - Isocrinidae
If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|F. Stiller 2011||Stem of small diameter, pentalobate (subcircular to subpentagonal to pentalobate to subpentastellate), consisting of smooth columnals. Nodals about equal in size to internodals and bearing, generally at mid-height, five small to moderately sized, strongly deepened and laterally outwardly to obliquely downwardly directed cirrus sockets.
Noditaxes with generally less than 10 columnals. Articulations
between nodals and infranodals cryptosymplectial to synostosial. All other articular facets of columnals symplectial with drop- to lancet-like petal floors surrounded by distinct crenulae oriented radially to peripherally. (Based on Klikushin 1982, 1983, emended herein.)